Tokina 11-16 f2.8 vs 12-28 f4 on D7100

Hey guys I have narrowed my WA lens choice down to the two lenses in the title. Just wondering how they compare in the overlapping area (12-16mm) ? I know that tokinas sometimes have trouble with CA-not massively worried about that. How do they compare sharpness wise at f4 and beyond? Main use will be for landscapes and travel. Where is each lenses strength - ie. are they good at the wide angle and then softer at the long end? The travel kit the winner will be paired with is a 18-140 and sigma 35 1.4. Love to hear your experiences. Thanks.